Vyatta

I want to know whether it is possible to control RS160D with Arduino? There is not much documentation available on RS160D! As per the manual released by robot-solutions company, it can be controlled only using computer or laptop through RS232 port!

You could indeed use an arduino - control from a PC is simply through use of a terminal program to manually send commands via the serial port. The arduino could do this for you, but note that you will need to convert your 5V signals to the RS232 levels required. A MAX232 is often used for this.